Semyon Bychkov leads Shostakovich’s eloquent Fifth Symphony, his most popular. Though the emotional heart of the work harbors a profound sadness, it is a work of epic grandeur with huge climaxes, triumphant marches, exhilarating brass, and an indomitable spirit. Plus Mendelssohn’s Piano Concerto No. 1 — at once virtuosic, melodious, and high-spirited — is a showcase for soloist Bertrand Chamayou.